Black and white photograph of the Beehive Geyser in eruption, Yellowstone National Park. Lena Billington Merrill can be seen at a short distance from the geyser.

Black and white photograph of the Beehive Geyser, Yellowstone National Park, with Lena Billington Merrill facing the camera.

Black and white photograph of the Grotto Geyser at rest, Yellowstone National Park.

Black and white photograph of the Riverside Geyser in eruption, Yellowstone National Park. A group of people are standing and watching the geyser erupt. Taken by Robert Merrill looking east.

Black and white photograph of the Riverside Geyser in eruption, Yellowstone National Park. Taken by Robert Merrill looking southeast.

Black and white photograph of Punch Bowl Spring, Yellowstone National Park.

Black and white photograph of the Daisy Geyser in eruption, Yellowstone National Park. A man is seen walking next to the geyser.

Black and white photograph of bears at the back of the Old Faithful Inn, Yellowstone National Park.

Black and white photograph of Kepler Cascades, Yellowstone National Park.

Black and white photograph of the West Thumb Paint Pots by Yellowstone Lake, Yellowstone National Park. Two women can be seen standing in the distance.

Black and white photograph showing a close view of a black bear cub, facing the camera. Taken by Robert Merrill at the Lake Colonial Hotel, Yellowstone National Park.

Black and white photograph showing a close view of a black bear cub, facing away from the camera. Taken by Robert Merrill at the Lake Colonial Hotel, Yellowstone National Park.